Combined guide and supporting bracket for valve-boring tools



Feb. 25, 1930. GREEN 1',748,877

COMBINED GUIDE AND SUPPORTING BRACKET FOR VALVE BORING TOOLS Filed May 1, 1928 INVENTOR .T Gnsmg,

ATTORNEY f Patented Feb; 25,1930- A nsnL T. GREEN, or ABERDEEN, SOUTH DAKQTA COMBINED Germ AND surronrms BRACKET non VALVE-BORING TOOLS Application filed. May -1,

This. invention Irelates to valve reseating and boring 'tools and more particularly to a combined guide and supporting bracket for such tools. 7 v I A primary: object cit-the invention is to provide-a simple and eff cient device of thls character "for use in connection with boring tools such; as those shown and descrlbed 1n -Another object is to provide a device of this character which may bequickly applied and removedand which, when in use, will reliably support and guide the boring tool, thereby ensuring the proper boring of recess I for valve seat'or facing of the valveseat.

In carrying out these objects, the invention is susceptible of modification without departing from the spirit onsacrificmg any of the advantages of the claimed lnvention;

' there being shown in the drawings for illusline 3 3 of Fig. 2, V Fig. 4 is a perspective view of the bracket detached, and

I 5 1s perspectlve new deplctmg an made in the form of asubs'tantially'u shaped' trative purposes a preferred and practical form, in which: 7 r

- Figure 1 represents a side elevation of this improved guide bracket shown applied.

Fig. 2-is a vertical sectlon of'the bracket detached, I

Fig. 8 is a horizontal section taken on the intermediate memberemployed in connection niththe bracket and the' tool holden' In the embodiment illustrated, an engine I cylinder 1 is shown having the usual block 2 with the head removed for the application of the facing or boring tool shown in general at 3. This tool 8 is, as above set forth con- ,struct-ed in accordance with my'invention described and claimed in my copending application, and has an upstanding pilot stem 4 i with a reduced extension 5 at the junction of which with thestem is formed an angular sage therethrough ofthe bolt 17, which 1928. Serial No. 274.285.

portion 6 for'engagement by a ratchet wrench 7 to be used in the boring operation. i

The combined guide bracket and support constituting this invention is shown in general at 10 and comprises an elongated base. 11

having a longitudinally extending slotv 12 through which is designed to be passedxa bolt '13 for adjustably mounting the guide on the engine block. Rising from one end of this base 11 is a standard 14 provided at its upper end with a concavo-convex head 15. havinga F'FIC'E i slot 16 extending longitudinally thereofto re- 'ceive a bolt 17 vwhich'supports the tool. carrying member 20 and adjustably mounts itonthe bracket 10. v This bolt extends through the slot 16 with its threadedportion projecting beyond the convex face of the-head 15 and has mounted thereon a washer 18 and nut 19-whereby it may be tightened-upland securelyheld in adjusted position in a manner presently to be described.

A semi-cylindrical block 26, preferably composed of polished steel, although ob'-- '10. This block 26 has a fiat'outer face27 designed to lie flat against the rear face of the holder 20 and its curved face 28is shaped to fit within the concave face of the'head 15. An'aperture 29 extends transversely through this block, preferably about midway the length thereofiand is designed for theqpasconnects the member 20 with the head 15. 7 F The tool holding member 20 is preferably bracket, the arm2l of which extends laterally relatively to the standard 14 when the parts arein operative position, and has a bore 22 to recelve the stem 4 ofthe tool, as is shown a screw 25lwhich islpr'eferably inthe form of a thumb screw and is designed to operate through said arm and bear on the upper end.

ofthe tool 3'to exert pressure thereon. The aperture 22 of the arm21 is of a si z e ;;,tofl

viously it may be constructed ofother suitable encircle the pilot stem 4 of the tool 3 as shown clearly in Fig. 1, and when the parts are assembled, as shown in said figure, thetool will be securely held against lateral movement relatively to the holder 20, pressure being exerted on the tool by the thumb screw 25 to maintain the tool in cutting relation with the piece to be bored or faced. The member 20 has a longitudinally extending slot 23 in the body portion thereof, as shown clearly in Fig. 2 for the passage therethrough of the bolt 17, the head of which overlies the outer face of said body at the slotted portion thereof and adjustably connects the member 20 relatively to the block 26.

The mounting of the tool holding member 20 on the standard 14 through the bolt 17 and the semi-cylindrical block 26 as well as the slots with the bolts extending therethrough and especially the slot in the base of the bracket provides for the adjustment of this member 20 both laterally, vertically, and outwardly and inwardly, providing a substan tial swivelled connection between the members 20 and 14, so that it may be used in connection with valves which are not at a right angle to the cylinder block.

To apply the bracket, all that is necessary is to insert the bolt 13 through the slotted base 11, said bolt being entered in one of the.

threaded sockets which is ordinarily used in connection with the engine head securing bolts.

Without further description it is thought that the features and advantages of the invention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit and scope of the claimed invention.

I claim 1. A combined guide and supporting structure for valve seat boring and facing tools comprising a longitudinally slotted base having an upstanding arm at one end thereof provided with a' concavo-convex head, said head being longitudinally slotted in the concavo-convex portion, a substantially U- shaped tool holding member having a relatively elongated bight portion, said bight portion having alongitudinally extended slot formed therein, a substantially semi-circular relatively elongated member having an opening extending radially therethrough, a bolt extended through a longitudinal slot in said bight portion, the opening in said semi-circa lar member, and the slot in said concavo-convex portion whereby a nut may be fitted thereon to clamp said tool holder to said upstanding arm with said semi-circular member disposed with the rounded portion thereof in said concavo-convex portion and the flat portion thereof in abutment with said bight portion.

'2. A combined guide and supporting bracket for valve seat boring and facing tools comprising a longitudinal slotted base having an upstanding arm at one end thereof,

provided with a concavo-convex head having the concave portion thereof opening in a direction away from said base, said conoavoconvex portion being longitudinally slotted, a substantially U-shaped member having a relatively elongated flat bight portion, said bight portion having a slot formed therein, one arm of said U-shaped member having a tool receiving bore formed therein, the other arm of said tool holding member having a threaded bore formed thereon in alignment wlth said tool receiving bore whereby a thumb screw may be mounted therein, a rela tively elongated member of semicircular cross section having an opening extending radially therethrough, a bolt member having the shank thereof extended through the slot in said bight portion, the opening in said semi-circular member, and the slot in said concavo-convex portion whereby the head thereof may be disposed in engagement with said bight portion while a nut may be fitted thereon on the portion thereof extended through said slot in said concavo-convex portion whereby said tool holding member may be clamped to said upstanding arm.

S gned at Aberdeen, in the county of Brown and State of South Dakota, this 16th day of April, A. D. 1928 v I ANSEL GREEN, 

